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  • • 
    >digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>pinMode(A4, "input_pulldown");
=undefined
>digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>pinMode(A4, "input_pullup");
=undefined
>digitalWrite(A4,1);
=undefined
>digitalRead(A4);
=0
>
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